Selena Gomez and Jimmy Fallon teamed up for an intimate and super cute performance of the YouTube hit 'Mario Kart Love Song' by Sam Hart, one of the most emo songs ever written about a video game.

Gomez appeared on the show to promote 'Spring Breakers,' which she is doing like a champ. But she let her musical side out. With Jimmy strumming his guitar, Sel took a seat next to him on a stool, and wore her Super Mario Bros. mustache proudly, even though she was the princess.

It was an adorbs, sweet rendition of a silly-cute song.

In the interview portion, Gomez talked about how she and her 'Spring Breakers' castmates raise some hell in the film. Jimmy talked about his past Spring Break experiences, which were not nearly as exciting as that of the character Selena plays in the film, out March 22.

Sel shares that she only experienced the rite of passage known as Spring Break through the movie, since she didn't have a normal young adulthood, being a famous singer and actress, and all.

She recalled flying to director Harmony Korine's house in Nashville to do her audition. He knew where she came from -- the Disney world -- and she had to trust him to help her break out of it.

Sel also said that the cast was put in real situations with real Spring Breakers, some of the NSFW photos of which you can see here. "People were hammered and taking their clothes off, and I was like, 'What is going on?'" she joked.

She did not diss her ex Justin Bieber during this late night appearance. She saved that for 'The Late Show With David Letterman.'